Mesa (master): u_blitter: restore stream output targets

[Christoph Bumiller]

Module: Mesa
Branch: master
Commit: b177e2c54c7dbec58c2547524abe89e52d458252
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b177e2c54c7dbec58c2547524abe89e52d458252

Author: Marek Olšák <maraeo at gmail.com>
Date:   Sat Nov 19 21:44:28 2011 +0100

u_blitter: restore stream output targets

---

 src/gallium/auxiliary/util/u_blitter.c |   18 ++++++++++++++++++
 src/gallium/auxiliary/util/u_blitter.h |   18 ++++++++++++++++++
 2 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_blitter.c b/src/gallium/auxiliary/util/u_blitter.c
index f5cc5cb..c0c477b 100644
--- a/src/gallium/auxiliary/util/u_blitter.c
+++ b/src/gallium/auxiliary/util/u_blitter.c
@@ -109,6 +109,7 @@ struct blitter_context_priv
 
    boolean has_geometry_shader;
    boolean vertex_has_integers;
+   boolean has_stream_out;
 };
 
 static void blitter_draw_rectangle(struct blitter_context *blitter,
@@ -148,6 +149,7 @@ struct blitter_context *util_blitter_create(struct pipe_context *pipe)
    ctx->base.saved_num_sampler_views = ~0;
    ctx->base.saved_num_sampler_states = ~0;
    ctx->base.saved_num_vertex_buffers = ~0;
+   ctx->base.saved_num_so_targets = ~0;
 
    ctx->has_geometry_shader =
       pipe->screen->get_shader_param(pipe->screen, PIPE_SHADER_GEOMETRY,
@@ -155,6 +157,9 @@ struct blitter_context *util_blitter_create(struct pipe_context *pipe)
    ctx->vertex_has_integers =
       pipe->screen->get_shader_param(pipe->screen, PIPE_SHADER_VERTEX,
                                      PIPE_SHADER_CAP_INTEGERS);
+   ctx->has_stream_out =
+      pipe->screen->get_param(pipe->screen,
+                              PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS) != 0;
 
    /* blend state objects */
    memset(&blend, 0, sizeof(blend));
@@ -319,6 +324,7 @@ static void blitter_check_saved_vertex_states(struct blitter_context_priv *ctx)
           ctx->base.saved_velem_state != INVALID_PTR &&
           ctx->base.saved_vs != INVALID_PTR &&
           (!ctx->has_geometry_shader || ctx->base.saved_gs != INVALID_PTR) &&
+          (!ctx->has_stream_out || ctx->base.saved_num_so_targets != ~0) &&
           ctx->base.saved_rs_state != INVALID_PTR);
 }
 
@@ -354,6 +360,18 @@ static void blitter_restore_vertex_states(struct blitter_context_priv *ctx)
       ctx->base.saved_gs = INVALID_PTR;
    }
 
+   /* Stream outputs. */
+   if (ctx->has_stream_out) {
+      pipe->set_stream_output_targets(pipe,
+                                      ctx->base.saved_num_so_targets,
+                                      ctx->base.saved_so_targets, ~0);
+
+      for (i = 0; i < ctx->base.saved_num_so_targets; i++)
+         pipe_so_target_reference(&ctx->base.saved_so_targets[i], NULL);
+
+      ctx->base.saved_num_so_targets = ~0;
+   }
+
    /* Rasterizer. */
    pipe->bind_rasterizer_state(pipe, ctx->base.saved_rs_state);
    ctx->base.saved_rs_state = INVALID_PTR;
diff --git a/src/gallium/auxiliary/util/u_blitter.h b/src/gallium/auxiliary/util/u_blitter.h
index 3e1457a..d02cfaf 100644
--- a/src/gallium/auxiliary/util/u_blitter.h
+++ b/src/gallium/auxiliary/util/u_blitter.h
@@ -104,6 +104,9 @@ struct blitter_context
 
    int saved_num_vertex_buffers;
    struct pipe_vertex_buffer saved_vertex_buffers[PIPE_MAX_ATTRIBS];
+
+   int saved_num_so_targets;
+   struct pipe_stream_output_target *saved_so_targets[PIPE_MAX_SO_BUFFERS];
 };
 
 /**
@@ -131,6 +134,7 @@ struct pipe_context *util_blitter_get_pipe(struct blitter_context *blitter)
  * - vertex elements
  * - vertex shader
  * - geometry shader (if supported)
+ * - stream output targets (if supported)
  * - rasterizer state
  */
 
@@ -379,6 +383,20 @@ util_blitter_save_vertex_buffers(struct blitter_context *blitter,
                             num_vertex_buffers);
 }
 
+static INLINE void
+util_blitter_save_so_targets(struct blitter_context *blitter,
+                             int num_targets,
+                             struct pipe_stream_output_target **targets)
+{
+   unsigned i;
+   assert(num_targets <= Elements(blitter->saved_so_targets));
+
+   blitter->saved_num_so_targets = num_targets;
+   for (i = 0; i < num_targets; i++)
+      pipe_so_target_reference(&blitter->saved_so_targets[i],
+                               targets[i]);
+}
+
 #ifdef __cplusplus
 }
 #endif